A right angle is a quarter of a full turn. It can be known as a ‘square corner’.

Review understanding and identification of right angles

Maths

In this unit pupils will compare the size of angles where there is a clear visual difference and use the terms acute, obtuse and reflex when describing the size of angles or amount of rotation with relation to right angles using a unit called degrees. In the future unit pupils will use knowledge of shape properties to draw, sketch and identify shapes.

In the prior unit pupils completed and composed symmetrical shapes from two congruent shapes and investigate lines of symmetry in 2D shapes. In this unit pupils will compare the size of angles where there is a clear visual difference and use the terms acute, obtuse and reflex when describing the size of angles or amount of rotation with relation to right angles using a unit called degrees.

Angles: compare, name, estimate and measure angles

An angle is a measure of turn. It shows how far something has rotated. It is often displayed as the rotation between two line segments.

Rotate means to turn around a fixed point. It is an action or movement.

Clockwise is the direction that the hands of an analogue clock travel.

Anticlockwise is the opposite direction to which the hands of an analogue clock travel.

Review understanding of angles as a measure of turn

An angle is a measure of turn. It shows how far something has rotated.

A right angle is a square corner or a quarter turn.

An angle that is smaller than a right angle is an acute angle.

An angle that is greater than a right angle but smaller than a straight line is an obtuse angle.

An angle that is greater than a straight line up to a full turn is a reflex angle.

Use the terms acute, obtuse and reflex when comparing angles to a right angle

A degree is a unit of measure for angles.

An arc is part of any curve. They can be used to show the angle between two lines.

Use the unit of degrees as a standard unit to measure angles

To estimate is to find a value that is close enough to the right answer, usually with some thought or calculation involved.

Describe static angles using the standard unit of degrees when compared to a right angle

A rotation is a circular movement around a fixed point.

Describe rotations using the standard unit of degrees when compared to a right angle

Estimate acute and obtuse angles using the standard unit of degrees

Know that the angles in a full turn sum to 360 degrees and use this to solve problems

A point is an exact location. It has no size, only position.

The sum is the total when numbers are added together.

Know that the angles at a point sum to 360 degrees and use this to solve problems

A quadrilateral is a polygon with four straight sides and four vertices.

The sum is the result of adding two or more numbers.

Angles in quadrilaterals

If something is opposite, it is placed on the other side.

Know that the angles on a straight line sum to 180 degrees and use this to solve problems

A triangle is a polygon with three straight sides and three vertices.

Angles in triangles

A vertex is a point where two or more lines meet.

A scale is a number line with equal divisions for equal values.

Measure the size of angles accurately using a protractor

A protractor is an instrument used to measure angles.

A polygon is a 2D shape made up of three or more straight lines.

Angles: compare, name, estimate and measure angles

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These lessons will be removed by end of Summer Term 2025.